[1] Kitano Hosp, Med Res Inst, Dept Neurosurg, Kita Ku, Osaka, Japan
[2] Kitano Hosp, Med Res Inst, Dept Radiat Oncol, Osaka, Japan
[3] Kitano Hosp, Med Res Inst, Dept Radiol, Osaka, Japan
[4] Kitano Hosp, Med Res Inst, Dept Pathol, Osaka, Japan
[5] Kishiwada City Hosp, Dept Neurosurg, Kishiwada, Japan
[6] Osaka Med Coll, Dept Neurosurg, Osaka, Japan
[7] Hyogo Kenritsu Amagasaki Hosp, Dept Neurosurg, Amagasaki, Hyogo, Japan
[8] Ako City Hosp, Dept Neurosurg, Ako City, Hyogo, Japan
[9] Shiga Univ Med Sci, Dept Neurosurg, Shiga, Japan
[10] Mie Univ, Dept Neurosurg, Fac Med, Tsu, Mie, Japan
[11] Saitama Med Univ, Int Med Ctr, Dept Neurosurg, Saitama, Japan